The January contract for Platinum
PLF11
rose to $1,751.70 an ounce, up $16.20.

The dollar index
DXY, +0.02%
which measures the greenback against a basket of six major currencies, fell as low as 79.956 earlier, from 80.34 in North American trading Monday. It lately traded around 80.396. Read about dollar.

The came under pressure earlier in the day after the Case-Shiller index tracking home prices in 20 U.S. metropolitan areas fell in October by more than analysts had predicted. See story on home prices.

Metals, along with other commodities priced in dollars, often trade inversely to moves in the greenback because otherwise the currency move would reduce the value of the commodities. Investors have flocked to metals, especially gold, this year, on a combination of their desirability as an alternative asset and as a hedge against the risk of future inflation.

Gold hit a record high earlier this year and is up 28% for the year.

Silver — a cheaper alternative to gold — has skyrocketed nearly 77%.

Copper also has appeal as an industrial metal that tends to benefit from global economic growth. It’s gained 29% this year.

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